Nothing strengthens authority so much as silence.

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Obstacles cannot bend me. Every obstacle yields to effort.

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once you have tasted the taste of sky, you will forever look up

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Nature is the source of all true knowledge. She has her own logic, her own laws, she has no effect without cause nor invention without necessity.

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Your brain is much better than you think; just use it!

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It had long since come to my attention that people of accomplishment rarely sat back and let things happen to them. They went out and happened to things.

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average human “looks without seeing, listens without hearing, touches without feeling, eats without tasting, moves without physical awareness, inhales without awareness of odour or fragrance, and talks without thinking.

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Experience is a truer guide than the words of others.

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The greatest deception men suffer is from their own opinions.

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There are three classes of people: those who see, those who see when they are shown, those who do not see.

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